Отправлено: 12.07.11 07:50. Заголовок: Luiz Fernando De Ros (Google навел)

Вроде как и банально, но сколько народу про это и слушать не хочет

The Sesmaria Field is located on the eastern margin of the Recôncavo rift basin, Brazil, and produces an average of 250 cubic
meters of oil per day, mostly from the Jurassic sandstones and conglomerates of the Sergi Formation. This unit was deposited by
a braided alluvial system that prograded from NW to SE through a cratonic basin, previous to rift rupture, under an arid/semiarid
climate. These conditions produced sandy deposits of large original continuity and compositional homogeneity.
The porosity and permeability of these essentially continuous and homogeneous bodies were, subsequently, greatly changed by
several intense diagenetic processes, from shallow eodiagenetic to deep mesodiagenetic conditions. The general sequence of
diagenetic phases and processes is:
1) eodiagenetic precipitates (caliches, silcretes and early dolomite);
2) mechanical clay infiltration;
3) mechanical compaction;
4) chemical compaction;
5) secondary quartz and feldspar overgrowths;
6) calcite cementation and replacement of silicates;
7) secondary porosity generation by calcite dissolution;
8) reactivation of mechanical compaction;
9) late authigenic precipitates (mainly chlorite, quartz, albite, titanium minerals and pyrite).
The development of this general sequence was inhibited or even aborted where early processes were particularly strong, such as
in the top of Sergi Formation, where clay infiltration was abundant.